The formula for the slope is (y2- y1)/ (x2 -x1)
substitute the values,
[tex]\frac{0-(-6\frac{1}{4})}{(-8\frac{4}{5}-0)}[/tex][tex]\frac{0-(-\frac{25}{4})}{(-\frac{44}{5}-0)}=\frac{\frac{25}{4}}{\frac{-44}{5}}=\frac{-25\times5}{44\times4}=\frac{-125}{176}[/tex]So the answer is -125/176.